Article | REF: NM3600 V1

Photocatalysis : from nanostructured materials to photocatalytic reactors

Authors: Delphine SCHAMING, Christophe COLBEAU-JUSTIN, Hynd REMITA

Publication date: August 10, 2017, Review date: January 13, 2021

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1. Catalysis and photocatalysis

The International Union of Pure and Applied Chemistry (IUPAC) defines catalysis as a process that increases the rate of a reaction without altering its free enthalpy.

Every catalytic reaction requires the use of a catalyst, a substance that initiates the catalytic process and appears both as a reactant and a product of the reaction, i.e. it is restored at the end of the process, and therefore does not appear in the overall reaction balance. In fact, the catalyst is involved in one (or more) stages of the reaction, which explains its influence on the speed of the reaction, and is then regenerated in a subsequent stage. As a result, the catalyst is used in much smaller quantities than the other reagents. What's more, the catalyst has no influence on the composition of the thermodynamic equilibrium at the end of the reaction....

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Catalysis and photocatalysis